System and method for obtaining a pupil response profile

A system for obtaining a pupil response profile, including a processing system comprising:

• an input component for obtaining scan data as frames of a pupil response over time prior to, during and after exposure to a flash of a light source, wherein one or more of the frames include with a reflection of a pupil locating light source of a given shape;
• a pupil locating component for locating a candidate pupil to be measured from the scan data including obtaining scan data of a reflection of a pupil locating light source of the given shape from the surface of an eye and identifying a generally circular image including a reflection of the given shape;
• an image processing component for image processing the scan data to obtain a set of pupil candidate measurements to generate a graph of pupil measurements against time,
• wherein the image processing component incudes standardising the pupil measurements by using a ratio of a measured pupil size and a measured distance between respective reflections of the given shape in the scan data of two eyes of a subject;
• a filtering component for filtering the graph to produce a final set of pupil measurements forming a pupil response profile;
• a profile parameter component for measuring profile parameters from the pupil response profile;
• and
• an output component for using the profile parameters to determine aspects of the pupil response.